life. ♪ nelson mandela nelson mandela ♪ >> reporter: but to grasp the true measure of what he means to south africa, listen to the children of this land. >> he's the one who fought for our freedom. >> reporter: mandela, who in his 27 years in prison was denied the chance to raise his own children, reached out to kids here when he was president and as an elder statesman with a special flair and joy. because of him, they dream big here now. what do you want to be when you grow up? >> i want to be a lawyer. >> reporter: a lawyer. excellent. >> i want to be a pilot. >> reporter: a pilot. i want to be a police. >> reporter: police? a nation transformed. mandela's body will lie in state right back there in the union building. the center of government. once the center of apartheid's oppression. and this week, the site of the ultimate honor for the man who brought down apartheid. >>> and, terry, that service tomorrow as you mentioned, a a massive memorial service. more than 90,000 people will be there, 90 world leaders. a massive security challenge, too. >> reporter: huge challenge for this